Inherit Intent Key on compilation

- Added Intent#key() method description
- Inherit key field from parent Intent during Intent
  compilation process
- Added assertion to existing unit tests

Change-Id: Iff85c5ec448b3f378957b7a20af865ad96cc3216
diff --git a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalCircuitIntentCompiler.java b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalCircuitIntentCompiler.java
index 0ce0b3c..9b131ae 100644
--- a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalCircuitIntentCompiler.java
+++ b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalCircuitIntentCompiler.java
@@ -244,6 +244,10 @@
             // Create optical connectivity intent
             connectivityIntent = OpticalConnectivityIntent.builder()
                     .appId(appId)
+                    // TODO New top-level Intent created and submitted
+                    // during compilation.
+                    // We'll need to track inter-Intent dependency,
+                    // but `key` field cannot be used for the purpose.
                     .src(srcCP)
                     .dst(dstCP)
                     .signalType(ochPorts.getLeft().signalType())
@@ -324,7 +328,7 @@
             rules.add(connectPorts(higherIntent.getDst(), lowerIntent.getDst(), higherIntent.priority(), slots));
         }
 
-        return new FlowRuleIntent(appId, rules, higherIntent.resources());
+        return new FlowRuleIntent(appId, higherIntent.key(), rules, higherIntent.resources());
     }
 
     /**
diff --git a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalConnectivityIntentCompiler.java b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
index f48b844..de25fda 100644
--- a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
+++ b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
@@ -189,6 +189,7 @@
 
         return OpticalPathIntent.builder()
                 .appId(parentIntent.appId())
+                .key(parentIntent.key())
                 .src(parentIntent.getSrc())
                 .dst(parentIntent.getDst())
                 // calling paths.iterator().next() is safe because of non-empty set
diff --git a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalOduIntentCompiler.java b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalOduIntentCompiler.java
index 2da9a40..1d60875 100644
--- a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalOduIntentCompiler.java
+++ b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalOduIntentCompiler.java
@@ -175,7 +175,7 @@
                 rules.addAll(createRules(intent, intent.getDst(), intent.getSrc(), path, slotsMap, true));
             }
 
-            return Collections.singletonList(new FlowRuleIntent(appId,
+            return Collections.singletonList(new FlowRuleIntent(appId, intent.key(),
                     rules, ImmutableSet.copyOf(path.links())));
         }
 
diff --git a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalPathIntentCompiler.java b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalPathIntentCompiler.java
index dc99574..26196b7 100644
--- a/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalPathIntentCompiler.java
+++ b/apps/optical-model/src/main/java/org/onosproject/net/optical/intent/impl/compiler/OpticalPathIntentCompiler.java
@@ -79,7 +79,10 @@
             rules.addAll(createReverseRules(intent));
         }
 
-        return Collections.singletonList(new FlowRuleIntent(appId, rules, intent.resources()));
+        return Collections.singletonList(new FlowRuleIntent(appId,
+                                                            intent.key(),
+                                                            rules,
+                                                            intent.resources()));
     }
 
     /**